POJ 3705 Reverse [解题报告] Java

Reverse

问题描述 :

You will be given a list of n integers S = {1, 2, … , (n-1), n}, please write a program to calculate the minimum number of instructions required to change the list in descending order {n, (n-1), …, 1}. Let S[i] denote the i-th element of S, 1 ≤ i ≤ n.

Each instruction takes a successive subsequence and removes that subsequence from the list, then insert that subsequence into any position of the list as a parameter. Each instruction can be represented by three numbers (pos1,length,pos2)，which means we will remove subsequence S[pos1] ….. S[pos1+length-1], then insert them after the S[pos2] (pos2=0 will insert it at the beginning). We always have: 1 ≤ pos1 ≤ n, 1 ≤ length ≤ n+1-pos1, 0 ≤ pos2 ≤ n-length

The first line of output contains one integer C denoting the number of instructions.Following C lines, each contains three numbers (pos1, length, pos2) for one instruction. If there are many such instructions, you can output any one of them.

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